Credit Facility (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jul. 29, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Line of credit maximum borrowing percentage of accounts receivable	85.00%
Line of credit maximum borrowing percentage of employee placement accounts	80.00%
Line of credit maximum borrowings percentage of corporate headquarters	80.00%
Quarterly reduction of additional corporate headquarters borrowing base	1.25%
Line of credit basis spread on variable rate under condition one	1.25%
Line of credit facility basis spread on variable rate under condition two	0.50%
Line of credit basis spread on variable rate under condition three	0.125%
Percentage of commitment of all lenders as condition to maintain min fixed charge coverage ratio	10.00%
Amount of commitment of all lenders as condition to maintain min fixed charge coverage ratio	$ 11,000,000
Line of credit remaining borrowing capacity	58,000,000
Long-term debt – credit facility	95,785,000		$ 80,472,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity	170,000,000
Line of credit current borrowing capacity available from amendment	$ 50,000,000
Line of credit unused capacity commitment fee percentage threshold	35.00%
Line of credit limit on equity security repurchases, max percent availability of borrowing capacity	15.00%
Line of credit limit on equity security repurchases availability of borrowing capacity	$ 15,000,000
Line of credit covenant limit on distributions max percent availability of borrowing capacity	12.50%
Line of credit covenant limit on distributions availability of borrowing capacity	$ 20,600,000
Revolving Credit Facility | Below Threshold
Line of Credit Facility [Line Items]
Line of credit unused capacity commitment fee percentage	0.35%
Revolving Credit Facility | Above Threshold
Line of Credit Facility [Line Items]
Line of credit unused capacity commitment fee percentage	0.25%
Letter of Credit
Line of Credit Facility [Line Items]
Line of credit sub limit for letters of credit	$ 15,000,000
Subsequent Event | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit remaining borrowing capacity		$ 57,000,000
Line of credit		$ 96,800,000